How to Grow Red Basil
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Red Basil
Ocimum basilicum var. purpurascens
herbRed Basil, also called Purple Basil or Rubra Basil, is an ornamental and culinary herb with deep burgundy to purple foliage and pink or purple flowers. It has a slightly spicy, clove-like flavor similar to green basil but with more complex undertones. The striking dark foliage makes it both beautiful in gardens and containers while remaining fully edible.
When should you plant Red Basil in your zone?
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Example Red Basil timeline · Pittsburgh, PA (Zone 6b)
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Plant Red Basil
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Red Basil
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Red Basil dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-11; grow as annual in cooler zones
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Germination & Seedling
2-3 weeksTiny seedlings emerge with small, dark purple-tinged cotyledons. First true leaves appear within 1-2 weeks, showing the characteristic basil leaf shape with deeper purple coloring.
Keep soil warm (70-75°F optimal) and consistently moist. Provide bright light immediately. Thin seedlings to prevent crowding. Avoid cold drafts.
Vegetative Growth
3-4 weeksPlant develops multiple stems and deepens its purple coloration. Leaves become larger and more abundant. The plant establishes a bushy form with strong root development.
Pinch off growing tips when plant reaches 6 inches tall to encourage bushier growth. Remove any early flower buds to promote leaf production. Provide consistent moisture and nutrients.
Branching & Expansion
2-3 weeksPlant becomes fuller with more lateral branches. Deep burgundy foliage becomes more pronounced. Plant reaches desired size for regular harvesting.
Continue pinching tips if you want more leaf production before flowering. Water regularly and maintain full sun exposure. Fertilize every 2-3 weeks with balanced fertilizer or compost tea.
Flowering
4-8 weeks (ongoing)Terminal spikes develop with small pink, lavender, or purple flowers. Flowers are attractive to pollinators. Leaves may become less tender after flowering begins.
Pinch off flower buds to extend leaf production if desired, or allow some flowers for pollinator support and ornamental value. Harvesting leaves regularly helps delay flowering.
Seed Setting & Maturity
Variable (plant lifespan)Flowers develop into seed heads. Plant energy shifts toward seed production. Growth slows in cooler seasons or with advancing age.
Allow some flowers to mature if saving seeds. Otherwise, continue removing flowers to extend productive life. In tropical zones, plant may persist; in cooler zones, replant annually.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick in early morning. Use neem oil or spinosad spray. Remove and destroy affected leaves.
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Spray with strong water stream to dislodge. Use insecticidal soap or neem oil. Encourage beneficial insects like ladybugs.
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Increase humidity by misting. Spray with neem oil or miticide. Ensure adequate air circulation.
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Remove infected plants. Ensure well-draining soil. Avoid overhead watering. Rotate planting locations yearly.
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Improve air circulation. Apply sulfur dust or baking soda spray (1 tbsp baking soda + 1 tbsp oil + 1 gallon water). Remove affected leaves.
Uses
Thai & Asian Cuisine
CulinaryRed Basil is a staple in Thai cooking, particularly in curries, stir-fries, and pad krapow moo. Its deeper, more complex spicy-clove flavor works beautifully in Southeast Asian dishes where it complements chili, garlic, and fish sauce. [source]
Pesto & Fresh Cooking
CulinaryUse fresh purple basil leaves in pesto, vinaigrettes, and fresh sauces. The striking dark color creates visually stunning dishes. Mix with green basil or use alone for a more complex, spicy pesto variation. [source]
Herbal Tea & Digestive Support
MedicinalDried or fresh red basil leaves make a warming herbal tea with digestive and anti-inflammatory properties. Traditionally used in Ayurvedic medicine to support digestion and reduce inflammation. [source]
Garden & Container Display
OrnamentalThe deep burgundy foliage and pink-purple flowers make Red Basil an attractive ornamental for flower beds, containers, and mixed plantings. It adds dramatic color contrast to gardens while remaining fully edible. [source]
Flower Arrangements & Drying
CraftFresh stems and flowers are beautiful in cut flower arrangements and floral designs. Flowers and leaves dry well for herbal crafts, potpourri, and decorative arrangements. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting leaves when plant is 6-8 inches tall by pinching off the top 2-3 leaf pairs. Harvest frequently (every few days) to encourage bushier growth and prevent flowering. Harvest in the morning after dew dries for best flavor. Always remove flower buds and terminal buds to extend harvest. Leaves are most tender and flavorful before flowering.
Fun Facts
- 🌱 Red Basil contains higher levels of anthocyanins (the same antioxidants that make blueberries purple) compared to green basil varieties, giving it both its striking color and additional health benefits.
- 🌱 In Thai cuisine, Red Basil (often called 'Bai Maengda') is considered distinctly different from Thai Holy Basil and is preferred for specific dishes where its slightly spicier flavor profile shines.
- 🌱 Red Basil flowers are highly attractive to butterflies, bees, and other pollinators, making it an excellent choice for pollinator gardens while still producing abundant edible leaves.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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